Joseph T. Nall Report - Aircraft Owners and Pilots Association
Joseph T. Nall Report - Aircraft Owners and Pilots Association
Joseph T. Nall Report - Aircraft Owners and Pilots Association
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Pilot Involvement<br />
MECHANICAL/<br />
MAINTENANCE 256 TOTAL/27 FATAL<br />
Mechanical/maintenance accidents accounted<br />
for 15 percent of all accidents <strong>and</strong> 8.4 percent of<br />
fatal accidents. By far, the largest percentage of<br />
these accidents was the result of powerplant or<br />
propeller problems (44.5 percent of all mechanical/<br />
maintenance accidents <strong>and</strong> 48.1 percent of fatal<br />
mechanical/maintenance accidents). In addition,<br />
another 74 accidents were classified as “power<br />
malfunction/loss for unknown reasons.” The<br />
investigations for 27 of these accidents were still in<br />
“preliminary” status when this report was compiled.<br />
Thus, the final count of mechanical/maintenance<br />
problems may change slightly when the<br />
final reports are in.<br />
<strong>Pilots</strong> should note that several of the mechanical<br />
failure accidents could have been prevented by<br />
a thorough preflight. Other accidents resulted<br />
when pilots incorrectly performed procedures after<br />
system failures occurred.<br />
Engine/Propeller<br />
L<strong>and</strong>ing Gear/<br />
Brakes<br />
Fuel System<br />
Controls/Airframe<br />
Electrical/Ignition<br />
Oil System<br />
Vacuum System/<br />
Instruments<br />
Percent<br />
16<br />
12<br />
Mechanical/Maintenance Accidents<br />
5.5% (14)<br />
3.7% (1)<br />
4.7% (12)<br />
3.7% (1)<br />
12.1% (31)<br />
3.7% (1)<br />
1.6% (4)<br />
11.1% (3)<br />
21.9% (56)<br />
0.0% (0)<br />
9.8% (25)<br />
29.6% (8)<br />
All Accidents<br />
Fatal Accidents<br />
0 10 20 30 40 50<br />
Percent<br />
Mechanical Accidents<br />
15.6% 14.1% 14.1% 15.0%<br />
44.5% (114)<br />
48.1% (13)<br />
8<br />
4<br />
0<br />
1996<br />
1997<br />
1998<br />
1999<br />
G ENERAL AVIATION A CCIDENTS<br />
Major Cause All Accidents Fatal Accidents<br />
Pilot 73.1% 68.1%<br />
Mechanical/Maintenance 15.0% 8.4%<br />
Other 7.5% 8.8%<br />
Unknown 4.4% 14.7%<br />
Total 1,701 320<br />
17